I have a friend who is a philosophy professor who literally has spent years turning this question over in his writings. It’s not that simple to come to an answer and I’m suspicious of anyone who acts like it is. Literally?? OK! But I think you'll find that many women are debating this, just as many TRAs (note that, not transpeople, the activists that claim to respresent them) insist it is simple TWAW!
And as for your 'friend' ... you really don't need to pull out the 'big guns' to make your point for you! You could have just said that you are suspicious of people who reduce the issue to simplistic terms, your point of view is valid, as worthy of debate as anyone elses! Value yourself!
I believe anything that genuinely threatens women’s safety should go in a favour of women. So a male rapist who then transitions should not be placed in a general population female prison. OK... so it's just what we each consider to be a genuine threat that we may disagree on!
In sports I think beet high barriers should be placed to prevent men from just identifying as female to compete with women - hormones, therapy, maybe even surgery. I think spell check got the better of you there... beet high ?
But - hormones,legislation is already in place, daft levels that are useless in terms of equalising peformance, possibly dangerous to the individual. Therapy? CBT perhaps? "Don't run too fast, hit too hard... it isn't womanly!"?? Surgery? Cutting off a penis or adding breasts isn't ging to change a lifetime of masculinity either!
I don’t however think that having a pre op trans woman in the changing room with me is inherently a threat to my safety and find those arguments a bit over the top. Ah! Yet I do not give you permission to remove my consent! And I an't even begin to put into words just how ridiculous that is.. a man, or male bodied person if your prefer, in a female space, where everyone is, at some point naked, is of no conceivebale threat? Not even a minor discomfort?
Being a woman is still a step down in terms of social power, the idea that men in any significant numbers would choose to identify as female so they can take things that are meant to go to women is difficult for me to believe. And yet we have many, many instances when just that happens... lots and lots and lots of them!